Sudden Power Outages and Restorations in Cabinet-Type Centrifugal Exhaust Fans

Sudden power outages! These are common in energy-intensive industries. In areas with excessive power consumption, outages occur more frequently. If our cabinet-type centrifugal exhaust fan experiences a power outage, how should we respond?

First, we must turn off the fan's power switch to prevent damage from sudden power restoration. Next, open the vent valve to avoid other issues.

Finally, inspect the wiring and troubleshoot any circuit faults. Sudden fan stoppage and power disconnection can stem from multiple causes. Further investigation is required to isolate and resolve the issue.

Earlier we discussed why cabinet-type exhaust centrifugal fans are vulnerable to sudden power restoration. If the switch is activated during a power surge, the fan may fail to start. This occurs because proper startup requires opening the exhaust valve first, then gradually closing it. The cabinet-type smoke exhaust centrifugal fan gradually builds pressure before finally closing the exhaust valve.

Cabinet-type smoke exhaust centrifugal fans must be equipped with a check valve. Without one, the fan impeller will be directly damaged if power is lost. We've encountered numerous such incidents where impellers suffered severe damage, abnormal noises, and other issues.

If the cabinet-type smoke exhaust centrifugal fan has been powered off, determine whether it resulted from a plant-wide power outage or production line aging. If a circuit fault is suspected, disconnect the main switch and inspect the circuit to pinpoint the issue. Resolve the fault before restoring power.